package Java_2_1;


import java.util.Scanner;

public class Java_2_1_5 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.print("请输入成绩:");
        int a=sc.nextInt();
        if(a<60) {
            System.out.println("等级A");
        }
        else if(a>=60 && a<=80) {
            System.out.println("等级B");
        }
        else if(a>=81 && a<=100) {
            System.out.println("等级C");
        }

    }

}
